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Test case:
Open Sales Order Window
Click New to create a new order
Select "Tree Farm Inc." in the business partner field (to do this is necessary to clear the Customer field in the info window)
right click on BP field and select Update
do a change and save
navigate to Tree Farm and you'll see that Vendor was unchecked, and Customer was checked
Problem is caused by https://idempiere.atlassian.net/browse/IDEMPIERE-3705#icft=IDEMPIERE-3705 implementation that must apply just on new records, not when changing.